Rice Husk Silica-Based magMCM-41 Composites: Synthesis, Characterization, and Pb(II) Adsorption Performance

Nita Trisnawati; Eti Rohaeti; Deden Saprudin; Sarah Yasir

doi:10.21009/JRSKT.121.05

Authors

Nita Trisnawati Department of Chemistry, Faculty of Mathematics and Science, Bogor Agricultural University, Jalan Tanjung Kampus IPB, Dramaga, Bogor
Eti Rohaeti Department of Chemistry, Faculty of Mathematics and Science, Bogor Agricultural University, Jalan Tanjung Kampus IPB, Dramaga, Bogor
Deden Saprudin Department of Chemistry, Faculty of Mathematics and Science, Bogor Agricultural University, Jalan Tanjung Kampus IPB, Dramaga, Bogor
Sarah Yasir Energy Research Cluster, Zero Carbon Manufacturing, Business and Energy Research Centre, University of Derby, Kedleston Road, Derby, DE22 1GB, United Kingdom

DOI:

https://doi.org/10.21009/JRSKT.121.05

Keywords:

adsorption, magMCM-41, magnetic adsorbent, Pb(II), rice husk silica

Abstract

Lead (Pb) contamination in water poses serious environmental and health risks, necessitating the development of effective and sustainable adsorbents for its removal. This study aimed to synthesize and characterize magMCM-41 composites derived from rice husk silica, and evaluate their performance for Pb(II) ion removal in aqueous solutions. The magMCM-41 was prepared by integrating magnetite (Fe₃O₄) nanoparticles into a mesoporous silica framework via co-preparation and sol-gel methods using cetyltrimethylammonium bromide (CTAB) as a template. Characterization by XRD, FTIR, BET, and PSA confirmed successful composite formation, revealing a high specific surface area o f 476.744 m²/g, a mesoporous framework (pore diameter 3.83 nm), and an average particle size of 362.7 nm. Adsorption conditions were optimized using Response Surface Methodology (RSM); pH positively influenced capacity, whereas adsorbent dosage had a negative effect. The maximum adsorption capacity was 115.77 mg/g at pH 5 with 0.05 g of adsorbent. The Dubinin-Radushkevich model best described the adsorption equilibrium (R²=0.935), indicating physisorption on a heterogeneous surface. Thermodynamic analysis confirmed a spontaneous and exothermic process. These results demonstrate that rice husk-derived magMCM-41 is a sustainable and magnetically separable adsorbent with high potential for Pb(II) remediation.

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